Improvement in door-checks



F. M. IDEN.

DOOR-CHECK. No.175,991. Patented Aprilll, 1876.

I L E K 7&2

WITNESSES; g I INVENTBR 0%WQ? W ATTDRNEY,

UNITED STATES PATENT OFFICE.

FRANCIS M. IDEN, OF FOREST CITY, MISSOURI.

IMPROVEMENT IN DOOR-CHECKS.

Specification forming part of Letters Patent No. 175,991, dated April11, 1876; application filed I December 30, 1875.

To all whom it may concern:

Be it known that I, FRANCIS M. IDEN, of Forest City, in the county ofHolt and State of Missouri, have invented certain new and usefulImprovements in Door-Cheeks, of which the following is a description andspecification:

The object of this invention is to provide a device which shall hold adoor at any desired angle, from nearly closed to wide open; and to thisend it consists of a novel combination of parts, as hereinafter fullydescribed and set forth and definitely pointed out in the claim. I

I11 the drawing, forming part of this specification, A is the door; B,its casing. C is an arm, above and parallel to the top edge of the door,and hinged at D to a part of the casing out of a vertical line with thehinges upon which the door turns. The arm C is spanned by a bracket, E,in which is pivoted asheave, preferably of india-rubber. The saidbracket is mounted upon a standard, G, inserted in a face-piece or lug,H, secured to the side of the door near its top. At the back of thebracket is a thumb'screw, I, which presses against a binder, K, byscrewing up which set-screw the pressure of the sheave F upon the arm Ecan be regulated at pleasure, as is clearly seen in I Fig. 2 of thedrawing.

The operation of this device is as follows: It will readily be seen thatthe radius of the are of the circle described by any point in the arm Cas the door is revolved on its hinges is greater than the radius of theare described by any point in the top of the door immediate ly below theformer point; the arm C must therefore slide through the bracket E ifthe door is revolved upon its hinges. If said arm be prevented fromsliding, the door will be .held in a fixed position. Now, by screwing upthe thumb-screw I and bringing great frietion between the sheave F andthe arm C, the said arm will be prevented from traversing through thebracket E, and the door will be held lixed in any position in which itmay be when the arm C is clamped by the set-screw I. The casing abovethe door may be suita FRANCIS M. IDEN.

Witnesses THEoPHILUs B. WREN, H. F. LiNsEL.

